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UBS Investment Bank
today announced that the
ETRACS Alerian MLP Infrastructure ETN (Ticker: MLPI) was the top performing exchange-traded product linked to the
Alerian MLP Infrastructure Index (Ticker: AMZI) for the month of February 2012.

Both MLPI and the Alerian MLP ETF (Ticker: AMLP) are designed to deliver the performance of the Alerian MLP Infrastructure Index (the “Index”). The table below summarizes their performance during the month of February 2012, year-to-date and since the day that both products could be purchased on an exchange:

Ticker

Price Return (February)

Total Return (February)

Price Return (YTD)

Total Return (YTD)

Total Return Since 8/25/2010*

MLPI

4.41%

4.41%

5.23%

6.55%

40.79%

AMLP

1.54%

3.02%

2.83%

4.32%

25.15%

Index

3.67%

4.55%

5.31%

6.83%

43.38%

Source: Bloomberg, 02/29/2012

*The first day that both products could be purchased on an exchange

MLPI first day of trading: 04/01/2010

AMLP first day of trading: 8/25/2010

About the Index

The Index is a liquid, midstream-focused
subset of the Alerian MLP Index comprised of 25 energy infrastructure MLPs. The Index, whose constituents generally earn the majority of their cash flow from the transportation and storage of energy commodities provides investors with a benchmark for the infrastructure component of this emerging asset class. The Index is calculated using a capped, float-adjusted, capitalization-weighted methodology that results in greater diversification versus a pure market capitalization-weighted index.

MLPI offers:

Exposure to a portfolio of 25 energy infrastructure MLPs through a single, exchange-traded security

Income via quarterly coupons linked to cash distributions, if any, paid by the MLPs in the Index, less fees 1

No K-1s: the coupons associated with the ETN are reported as ordinary income on Form 1099, and therefore the administrative burden associated with K-1 forms is eliminated 2.

Exchange Traded Access Securities ETNs (“ETRACS ETNs”), are exchange-traded notes, an innovative class of investment products offering access to markets and strategies that may not be readily available to investors, and offer unique diversification opportunities in a number of different sectors. ETRACS ETNs may offer:

Access to asset classes with historically low correlations to more traditional asset classes

Convenience of an exchange-traded security

Transparent exposure to a published index

ETRACS ETNs are senior unsecured notes issued by UBS AG (“UBS”), are traded on NYSE Arca, and can be bought and sold through a broker or financial advisor.
An investment in ETRACS ETNs is subject to a number of risks, including the risk of loss of some or all of the investor’s principal, and is subject to the creditworthiness of UBS. We urge you to read the more detailed explanation of risks described under “Risk Factors” in the prospectus supplement for the ETRACS ETN.

There are 41 ETRACS ETNs:

ETRACS ETN Name

Ticker

Master Limited Partnerships

Alerian MLP Infrastructure

MLPI

2x Monthly Leveraged Long Alerian MLP Infrastructure

MLPL

1x Monthly Short Alerian MLP Infrastructure TR*

MLPS

Alerian Natural Gas MLP

MLPG

Wells Fargo MLP Index

MLPW

Business Development Companies

Wells Fargo Business Development Company Index

BDCS

2x Monthly Leveraged Wells Fargo Business Development Company Index

BDCL

Alpha Strategies

Long-Short S&P 500 VIX Futures

XVIX

Natural Gas Futures Contango ETN

GASZ

Oil Futures Contango ETN

OILZ

Hybrid

S&P 500 Gold Hedged

SPGH

Fisher-Gartman Risk On ETN

ONN

Fisher-Gartman Risk Off ETN

OFF

Commodities

CMCI TR

UCI

CMCI Agriculture TR

UAG

CMCI Energy TR

UBN

CMCI Food TR

FUD

CMCI Gold TR

UBG

CMCI Industrial Metals TR

UBM

CMCI Livestock TR

UBC

CMCI Long Platinum ER*

PTM

CMCI Short Platinum ER

PTD

CMCI Silver TR

USV

DJ-UBS Commodity Index TR

DJCI

Equities

Next Generation Internet ETN

EIPO

Monthly 2xLeveraged Next Generation Internet ETN

EIPL

Long ISE Solid State Drive Index

SSDD

2xLeveraged Long ISE Solid State Drive Index

SSDL

Monthly 2xLeveraged ISE Cloud Computing TR

LSKY

Volatility

Long-Short S&P 500 VIX Futures

XVIX

Long 1-Month S&P 500 VIX Futures

VXAA

Long 2-Month S&P 500 VIX Futures

VXBB

Long 3-Month S&P 500 VIX Futures

VXCC

Long 4-Month S&P 500 VIX Futures

VXDD

Long 5-Month S&P 500 VIX Futures

VXEE

Long 6-Month S&P 500 VIX Futures

VXFF

Short 1-Month S&P 500 VIX Futures

AAVX

Short 2-Month S&P 500 VIX Futures

BBVX

Short 3-Month S&P 500 VIX Futures

CCVX

Short 4-Month S&P 500 VIX Futures

DDVX

Short 5-Month S&P 500 VIX Futures

EEVX

Short 6-Month S&P 500 VIX Futures

FFVX

*TR=Total Return and ER=Excess Return

The contents of any website referred to in this communication are not part of, or incorporated by reference in, this communication. UBS has filed a registration statement (including a prospectus, as supplemented by a prospectus supplement for the offerings of the ETRACS ETNs) with the Securities and Exchange Commission (the “SEC”) for the offerings to which this communication relates. Before you invest, you should read these documents and any other documents that UBS has filed with the SEC for more complete information about UBS and the offering to which this communication relates. You may get these documents for free by visiting EDGAR on the SEC website at
www.sec.gov. Alternatively, you can request the prospectus and the applicable prospectus supplement by calling toll-free (+1.877.387.2275). Futures and futures options trading is speculative, involves a high degree of risk and is not suitable for all investors. Past performance is not necessarily indicative of future results.

1 Quarterly coupons are linked to the cash distributions, if any, paid by the MLPs in the Index, less fees. If the MLPs do not make distributions, or these distributions do not overcome the investor fees, the investor will not receive any coupons. You are not guaranteed any coupon or distribution amount under the ETN.

2 Significant aspects of the tax treatment of the ETNs are uncertain. You should consult your own tax advisor about your own tax situation.

Product Features:

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